Trump had long expressed dismay at the terms of the agreement, negotiated during former President Obama’s second term in office and signed in 2015.

Beyond the decision to abandon what he called a “horrible, one-sided deal,” what were the main takeaways from his announcement?

A sharp break from Europe

The United Kingdom, France, Germany are all signatories to the Iran deal — and had all urged Trump to stay in it, in some shape or form.

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Recent visits to Washington by French President Emmanuel Macron, German Chancellor Angela Merkel and British Foreign Secretary Boris Johnson were focused on trying to find some way to keep Trump on board.

His decision to exit the deal is a rebuke to them all.

Soon after the announcement, Macron, Merkel and British Prime Minister Theresa May released a joint statement expressing “regret and concern” over the decision.

They also encouraged Iran to “show restraint” in response to Trump’s announcement and — predictably but crucially — said that they remain committed to the deal.

To Trump critics, the European response suggests that the U.S. has dealt itself a self-inflicted wound.

Trump’s basic argument on the Iran deal is that it does not look after American interests first, nor provide for American security.

“America will not be held hostage to nuclear blackmail. We will not allow American cities to be threatened with destruction. And we will not allow a regime that chants ‘Death to America’ to gain access to the most deadly weapons on Earth,” he said in his remarks in the Diplomatic Room of the White House.

While Trump’s unilateral tendencies cause consternation among much of the Washington foreign policy establishment, his unabashed nationalism is clearly a draw for his supporters.

So too is his willingness to argue that he is following through on his campaign promises.

“The United States no longer makes empty threats. When I make promises, I keep them,” Trump said on Tuesday.

A major Obama legacy, undone

Beyond the winding down of the wars in Iraq and Afghanistan, the Iran deal was perhaps Obama’s biggest foreign policy achievement.

Trump had essentially erased it, at least so far as U.S. involvement is concerned.

Obama hit back in a lengthy statement in which he praised the deal as a “model for what diplomacy can accomplish.” In its absence, he warned, “the United States could eventually be left with a losing choice between a nuclear-armed Iran or another war in the Middle East.”

Other Democrats attacked Trump for, in their view, being guided more by a reflexive anti-Obama impulse than by a fair appraisal of the agreement’s strengths and weaknesses.

“Everything President Obama has done, this president wants to undo,” Sen. Dianne Feinstein (D-Calif.) tweeted. “An agreement that prevents Iran from acquiring a nuclear weapon is one thing that should never be undone just to satisfy a campaign promise.”

Trump’s decision was a big victory for the Israeli prime minister, who claimed last week to have evidence that Iran had been “brazenly lying” when its leaders had insisted they were not pursuing nuclear weapons prior to the deal.

Netanyahu had previously praised Trump’s decision to move the U.S. Embassy in Israel to Jerusalem from Tel Aviv.

The supportive relationship between the two men is a marked difference to the chilliness that characterized Netanyahu’s dealings with Obama.